a guidance system for an aeronautical or space vehicle by which an automatic device in the vehicle takes periodic fixes on celestial bodies to determine the vehicle's position and to guide it along a particular flight path.
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Also called astro-inertial guidance.
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British Dictionary definitions for celestial guidance
the guidance of a spacecraft or missile by reference to the position of one or more celestial bodies
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012